Connected: An Internet Encyclopedia
RFC 1123 - 3.5. TELNET REQUIREMENTS SUMMARY

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### 3.5. TELNET REQUIREMENTS SUMMARY

                                                     |        | | | |S| |
                                                     |        | | | |H| |F
                                                     |        | | | |O|M|o
                                                     |        | |S| |U|U|o
                                                     |        | |H| |L|S|t
                                                     |        |M|O| |D|T|n
                                                     |        |U|U|M| | |o
                                                     |        |S|L|A|N|N|t
                                                     |        |T|D|Y|O|O|t
    FEATURE                                          |SECTION | | | |T|T|e
    -------------------------------------------------|--------|-|-|-|-|-|--
                                                     |        | | | | | |
    Option Negotiation                               |3.2.1   |x| | | | |
      Avoid negotiation loops                        |3.2.1   |x| | | | |
      Refuse unsupported options                     |3.2.1   |x| | | | |
      Negotiation OK anytime on connection           |3.2.1   | |x| | | |
      Default to NVT                                 |3.2.1   |x| | | | |
      Send official name in Term-Type option         |3.2.8   |x| | | | |
      Accept any name in Term-Type option            |3.2.8   |x| | | | |
      Implement Binary, Suppress-GA options          |3.3.3   |x| | | | |
      Echo, Status, EOL, Ext-Opt-List options        |3.3.3   | |x| | | |
      Implement Window-Size option if appropriate    |3.3.3   | |x| | | |
      Server initiate mode negotiations              |3.3.4   | |x| | | |
      User can enable/disable init negotiations      |3.3.4   | |x| | | |
                                                     |        | | | | | |
    Go-Aheads                                        |        | | | | | |
      Non-GA server negotiate SUPPRESS-GA option     |3.2.2   |x| | | | |
      User or Server accept SUPPRESS-GA option       |3.2.2   |x| | | | |
      User Telnet ignore GA's                        |3.2.2   | | |x| | |
                                                     |        | | | | | |
    Control Functions                                |        | | | | | |
      Support SE NOP DM IP AO AYT SB                 |3.2.3   |x| | | | |
      Support EOR EC EL Break                        |3.2.3   | | |x| | |
      Ignore unsupported control functions           |3.2.3   |x| | | | |
      User, Server discard urgent data up to DM      |3.2.4   |x| | | | |
      User Telnet send "Synch" after IP, AO, AYT     |3.2.4   | |x| | | |
      Server Telnet reply Synch to IP                |3.2.4   | | |x| | |
      Server Telnet reply Synch to AO                |3.2.4   |x| | | | |
      User Telnet can flush output when send IP      |3.2.4   | |x| | | |
                                                     |        | | | | | |
    Encoding                                         |        | | | | | |
      Send high-order bit in NVT mode                |3.2.5   | | | |x| |
      Send high-order bit as parity bit              |3.2.5   | | | | |x|
      Negot. BINARY if pass high-ord. bit to applic  |3.2.5   | |x| | | |
      Always double IAC data byte                    |3.2.6   |x| | | | |
      Double IAC data byte in binary mode            |3.2.7   |x| | | | |
      Obey Telnet cmds in binary mode                |3.2.7   |x| | | | |
      End-of-line, CR NUL in binary mode             |3.2.7   | | | | |x|
                                                     |        | | | | | |
    End-of-Line                                      |        | | | | | |
      EOL at Server same as local end-of-line        |3.3.1   |x| | | | |
      ASCII Server accept CR LF or CR NUL for EOL    |3.3.1   |x| | | | |
      User Telnet able to send CR LF, CR NUL, or LF  |3.3.1   |x| | | | |
        ASCII user able to select CR LF/CR NUL       |3.3.1   | |x| | | |
        User Telnet default mode is CR LF            |3.3.1   | |x| | | |
      Non-interactive uses CR LF for EOL             |3.3.1   |x| | | | |
                                                     |        | | | | | |
    User Telnet interface                            |        | | | | | |
      Input & output all 7-bit characters            |3.4.1   | |x| | | |
      Bypass local op sys interpretation             |3.4.1   | |x| | | |
      Escape character                               |3.4.1   |x| | | | |
         User-settable escape character              |3.4.1   | |x| | | |
      Escape to enter 8-bit values                   |3.4.1   | | |x| | |
      Can input IP, AO, AYT                          |3.4.2   |x| | | | |
      Can input EC, EL, Break                        |3.4.2   | |x| | | |
      Report TCP connection errors to user           |3.4.3   | |x| | | |
      Optional non-default contact port              |3.4.4   | |x| | | |
      Can spec: output flushed when IP sent          |3.4.5   | |x| | | |
      Can manually restore output mode               |3.4.5   | |x| | | |
                                                     |        | | | | | |

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Connected: An Internet Encyclopedia
RFC 1123 - 3.5. TELNET REQUIREMENTS SUMMARY